Conference Proceedings - IAD

39th IAD Conference, August 2012, Szentendre, Hungary
bottom sediments from the river source to the lowland. In the zone of the stable
sediments at the altitude of 1000 m a. s. l. and above communities with high
species numbers were formed, which are presented relatively evenly. In zones of
intensive sediment erosion, forming of stable communities is practically
impossible – species number decrease, their combinations are random, portion
of species, adapted to constant erosion increased. Intensive channel processes
condition “dip” of the quantitative parameters at the altitude of 600–800 m a. s. l.,
where intensive retrogressive deposition of the bottom sediments occurs. In the
zone of the sediment transport, where erosion is alternated with partial
deposition, habitat diversity grows, thus species number increases, and
dominance decreases. When bottom sediments change to accumulative type,
wider diapason of parameters and growth of the general dominance increases.
The average functional activity of the mountain rivers’ bottom sediments is quite
stable along all river streams from the source to lowland. At this S-shaped
character of trend is “equalized” by the antagonistic effects on the integral
parameter of the community functioning, particularly by growth of the average
size of a specimen, which leads to a decrease in oxygen consumption; and by
gradual growth of temperature, which leads to an increase in oxygen
consumption.
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